Coating compositions containing airdrying fluorine containing compounds



United States Patent C) 6 Claims. (Cl. 106-287) ABSTRACT OF THE DISCLOSURE Coating compositions containing compounds of the formulae and K I o Ho-(:J-c(oHz r(iCHz-iiA-Z K1 CH2 where X, Y, A and Z are various aliphatic and aromatic radicals and K and K are perchloroalkyl, perfluoroalkyl or perchloro-fluoroalkyl radicals.

Cross-references to related applications This application is a divisional of application Ser. No. 297,677, filed July 25, 1963, now Patent No. 3,340,275.

Summary of the invention This invention relates to coating compositions containing air-drying fluorine-containing compounds \as filmformers. It is more particularly directed to coating compositions containing compounds represented by the formula c H where:

n is

1n is X is 3,370,970 Patented Feb. 27, 1968 ice K and K are perchloroalkyl, perfiuoroalkyl or perchloro-fiuoroalkyl radicals, all containing 1 through 5 carbon atoms.

Illustrative of the perchloro-fluoro radicals in the K and K positions are --CF CF Cl, -CCl F, -C F -C3F7, -C5F11, 0 1 and --CF CF C]1.

This invention is also directed to coating compositions containing compounds represented by the formula Kand K are as described in Formula 1.

The compounds of Formulae 1 and 2 polymerize in the presence of siccative metal compounds and oxygen to form insoluble, tough, durable coatings. The compounds are therefore useful as film-formers in coating compositions.

The presence of fluorine atoms in the compounds gives the resulting finishes superior durability and resistance to steam, Water and solvents. This makes them suitable for use in formulating metal protective primers, aerosol enamels, automotive refinish enamels, decorative coatings for tin plate and exterior and interior house paints.

The compounds are liquids and so require no solvents in their formulation. Thus, coating compositions contain- The compounds of Formula 2 can be prepared according to the equation In Equations 3 and 4, X, Y, A, Z, K, K in and n are defined as in Formulae l and 2.

Some of the starting materials used in the method of Equation 3 can be made by the reaction of hydroxy-alkyl- 2-vinyl-l,3-dioxolanes or dioxanes with polyfunctional acids. This is set forth in greater detail in U.S. Patent 3,010,923 to Carol K. Ikeda. The others can be made by the reaction of acrolein with polyols, as described in J. Org. Chem., 25, 319 (1960).

Certain of the starting material used in the method of Equation 4 can be made by the reaction of dihydro-pyran- 2-methanol with polyfunctional acids. Thi is described in detail in copending U.S. application Ser. No. 99,047, filed Mar. 29, 1961, now abandoned. The others are commercially available.

The lower perhaloketone reactants are available commercially. The higher ketones can be made by methods described in M. Haupschein and R. A. Braun, J.A.C.S., 77, 4930 (1955).

The reactions of Equations 3 and 4 are carried out by mixing exactly equimolar quantities of the reactants and then placing them in a bomb with about an equal volume of a hydrocarbon solvent such as benzene or hexane.

The bomb is then heated to a temperature of from 100- 175 0, preferably at 125-150 C. This temperature is maintained for from 1 to 12 hours. In most instances, the reaction will be substantially complete in about five hours. Completion can be determined by observing a decrease in pressure during the reaction.

Generally, from 0.1 to 1% of a free radical inhibitor such as hydroquinone is used to prevent polymerization during heating.

The compounds are isolated by removing the solvent and traces of unreacted ketone under vacuum. The liquid essentially pure product is left behind. This can be used directly in the preparation of coating compositions.

Coating compositions can be prepared using the compounds of this invention by simply mixing them with the usual amount of a conventional siccative metal drier such as cobalt butyl phthalate. This gives clear, unpigmerited finishes. If desired, conventional pigments, in the usual amounts, can be added to these coating compositions by the usual blending and grinding techniques of sand-grinding, ball-milling, or the like.

The coating compositions of this invention can also be used together with other liquid air-drying coacting compositions to give various modifying effects.

The compositions of the invention can be applied by brushing, dipping or spraying, and require no special processing or equipment. If thinning is required, the compositions can be diluted with conventional paint thinners such as esters or ketones.

Description of the preferred embodiments EXAMPLE 1 The following are added to a one-liter stainless steel bomb:

Parts Itaconic acid diester of 4-hydroxy-methyl-2-vinyl- 1,3-dioxolane 129 Hydroquinone 0.3 Benzene 300 Hexafiuoroacetone 50 The bomb is heated to 125 C. and is held at that temperature for five hours.

It is then cooled to room temperature and the solvent is removed by vacuum stripping at 25 C. and 0.1 mm. of

6 pressure to give 183 parts of an essentially pure pale yeling compounds of the invention which can be similarly low fluid having the structure formulated into coating compositions:

e (I? CF3C-CF3 (I)I O CHQ=CH-C-OCHzCH-(CHz)4-O-CfiCH2- -O(CHz)4-SJHCH CH2 O 0H=0H, H A coating composition can be prepared, using this com- Perfiuorohepan-2-one pound as a film-former, by mixing it with 0.05% of cO- 1,1,1-trichlorotrifiuoroacetone balt butyl phthalate. Perfiuoropentan-Z-one This composition is applied to a steel plate with a 3 2-vinyl-l,3-dioxolane-4-butyric acid ester of 4-hydroXymil doctor blade to a film thickness of about 1.5 mils. methyl-Z-vinyl-1,3-dioxolane This film dries to a tack-free state in about 5 hours at 25 1,2-bis-[4-(2-vinyl-1,3-dioxaneyl) lethane. C. The drying time can be shortened by baking at a temperature of from 40-150 C. The actual drying time is EXAMPLE 3 naturally determined by the film thickness as well as the temperature. The following are placed in a stainless steel bomb.

The ketones and cyctic acetal derivatives listed in the Parts following table can be used in place of hexafluoroacetone ItaCPnic 301d diester 0f Y y Y Y and the itaconic acid diester of 4-hydroxymethyl-2-vinyl- QX B 176 1,3-dioxolane, in the same proportions, to give the corre- 1, -d1c1110rotetrafiuoroacetone 80 sponding compounds of the invention, which can be simie z e 200 larly formulated into coating compositions: Hydroquinone 0.3 Perfiuorohepan-4-one The bomb is heated at 150 C. for four hours. It is 1,1,2-trichlorotrifluoroacetone then cooled and the solvent stripped under vacuum to Terephthalic acid diester of 4-hydroxybutyl-2-vinyl-1,3- give 245 parts of a clear yellow essentially pure oil havdioxolane ing the structure (I? CIFflO-C-CFaC]. (I) O CH2=OH- COCHnCH-(CH2)AOfiGHz O(C-Hz)4-?H--(H CH: o\ /o OHFCfi H Sebacic acid diester of 4-hydroxymethyl-2-vinyl-1,3-dioxo- A coating composition is prepared using this compound lane 40 as a film-former by adding 50 parts of titanium dioxide, Itaconic acid diacid esters of 4-hydroxymethyl-2-vinylpigment grade, to 100 parts of the compound.

1,3-dioxane This mixture is then sand-ground to give a smooth dis- 2-vinyl-5-octenedioic acid diacid ester of 4-hydroxybuty1- persion to which are added, with thorough mixing, 0.05

2-vinyl-L3-dioxolane. parts of cobalt as cobalt octoate.

EXAMPLE 2 This composition is applied by brush as a house paint to give a glossy, adherent and durable coating. The following are charged to a stainless steel bomb:

Parts EXAMPLE 4 1 'd t r 4-11 (1 in 1-2- 1-1,3- g z g fs i i i ii ifffffiii ffi 42.4 The following are placed into a stainless steel bomb: Benzene 150 Parts fi fiig g ggg Itaconic acid diester of dihydropyran-Z-methanol 64.2 y q 6 Benzene 100 The bomb is heated to 125 C. and maintained at this Hexafluoroacetone 34 temperature for 6 hours.

It is then cooled and the solvent removed by stripping The bomb is heated at 150 C. for 4 hours. The mixture to give 63.8 parts of a slightly viscous oil having the strucis then cooled and the solvent removed under vacuum ture to give 114 parts of a clear, orange viscous liquid having CH2=C \H 0.05 percent of cobalt butyl phthalate is added to this the structure oil and it is then applied to a steel plate with a 3.3-mil doctor blade to a film thickness of about 1.5 mils. This film in, i r") dries tack-free at 80 C. in less than 2 hours. The same CH film dries tack-free at 25 C. in less than 18 hours. 1 m g 2- a r a 0 The ketones and dioxane derivatives listed in the following table can be used in place of hexafluoracetone and 10 parts of this compound are mixed with 0.05 part of the maleic acid diester of 4-hydroxymethyl-2-vinyl-1,3-dicobalt (as cobalt butyl phthalate) applied to a redwood oxolane, in the same proportions, to give the correspondpanel. The film dries to a clear, tack-free coating after 7 twenty-four hours at room temperature, or after about one hour of baking at 50 C.

The reactants in the following list can be used in place of the hexafluoroacetone and the itaconic acid diester of dihydropyranQ-methanol, in the same proportions, to give corresponding compounds of the invention which can be similary formulated into coating compositions:

CH=CH2 and K and K are perchloroalkyl, perfluoroalkyl or perchloro-fluoroalkyl radicals, all containing 1 through 5 car- 'bon atoms, and a siccative metal drier.

2. A coating composition comprising a compound of the formula W- Fl and K and K are perchloroalkyl, perfluoroalkylfo r perchloro-fiuoroalkyl radicals, all containing 1 through 5 carbon atoms, and a siccative metal drier.

3. The composition of claim 1 wherein the compound is OH 0 CF5(3CF3 o l CH=CH2 4. The composition of claim 1 wherein the compound is ll oiiFouw-o-om-ononni-o-o- 9 19 5. The composition of claim 1 wherein the compound References Cited 18 UNITED STATES PATENTS B 3,010,918 11/1961 Ikeda 260-883 9 oF2o1-o-0F2o1 3 5 3,197,320 7/1965 Graham 106--287 CHZ=CHCO"CHZ-OH-(GHzh-O-(-fi-OH -C-O-(Oflgh-m 3,301,593 1/ 1967 Ikeda 106-337 0 0 ALEXANDER H. BRODMERKEL, Primary Examiner.

| T. MORRIS, Assistant Examiner. CH=CH2 6. The composition of claim 2 wherein the compound is 

